Study on the damage behavior and energy dissipation characteristics of basalt fiber concrete using SHPB device

Abstract

Basalt fiber concrete, as a new type of composite material with low price and superior performance, has a broad market and prospect in the field of civil engineering and construction. However, in practice, it is susceptible to destruct damage by dynamic loads such as explosions and collisions. In this paper, the damage behavior and energy dissipation characteristics of basalt fiber concrete with five different fiber contents were investigated under four different strain rates based on the split Hopkinson pressure bar test apparatus. The results show that the fractal dimension of basalt fiber concrete increases linearly with strain rate, and the incorporation of fibers decreases the rate of fractal dimension growth. The dynamic damage process of concrete can be divided into four sections: initial compaction section, plastic yielding section, post-peak energy accumulation section, and post-peak damage section. The dissipated energy density tends to increase linearly with increasing strain rate. The energy dissipation rate of concrete shows a quadratic function trend with the increase of fractal dimension or the strain rate. With the help of the damage tolerable extremes M of the specimens, it was found that the concrete performed optimally at 0.1% fiber content and could withstand the maximum damage. Finally, with the help of numerical simulation software LS-DYNA, the damage evolution process of basalt fiber concrete was reproduced, and the energy dissipation law of the specimens was further explored.